Both "Chris" and "copy of Chris" are Chris Hallquist. Both remember being Chris Hallquist, which is the only way anyone's identity ever persists. Copy of Chris would insist that he's Chris Hallquist for the same reason the original Chris would insist so. And as far as I'm concerned, they'd both be right - because if you weren't in the room when the copying process happened, you'd have no way of telling the difference. I don't deny that as time passes they gradually would become different people.
I prefer to frame things this way. Suppose you take Chris Hallquist and scan his entire body and brain such that you could rebuild it exactly the same way later. Then you wait 5 minutes and then kill him. Now you use the machine to rebuild his body and brain. Is Chris Hallquist dead? I would say no - it would basically be the same as if he had amnesia - I would prefer to experience amnesia than to be killed, and I definitely don't anticipate having the same experiences in either case. Yet your view seems to imply that, since the original was killed, despite having a living, talking Chris Hallquist in front of you, it's somehow not really him.
Edit: Moreover, if I was convinced the technology worked as advertised, I would happily undergo this amnesia process for even small amounts of money, say, $100. Just to show that I actually do believe what I'm saying.
with regard to "Yet your view seems to imply that, since the original was killed, despite having a living, talking Chris Hallquist in front of you, it's somehow not really him."
Yes, I do believe that the copy of Chris Hallquist would have an identical consciousness (until, as you stated, he had some new experiences), but the original (non-copy) Chris is still gone. So from a functional perspective I can interact with "copy of Chris" in the same way, but the original, unbroken consciousness of "original Chris" is still gone, w...
Background:
On the most recent LessWrong readership survey, I assigned a probability of 0.30 on the cryonics question. I had previously been persuaded to sign up for cryonics by reading the sequences, but this thread and particularly this comment lowered my estimate of the chances of cryonics working considerably. Also relevant from the same thread was ciphergoth's comment:
Based on this, I think there's a substantial chance that there's information out there that would convince me that the folks who dismiss cryonics as pseudoscience are essentially correct, that the right answer to the survey question was epsilon. I've seen what seem like convincing objections to cryonics, and it seems possible that an expanded version of those arguments, with full references and replies to pro-cryonics arguments, would convince me. Or someone could just go to the trouble of showing that a large majority of cryobiologists really do think cryopreserved people are information-theoretically dead.
However, it's not clear to me how well worth my time it is to seek out such information. It seems coming up with decisive information would be hard, especially since e.g. ciphergoth has put a lot of energy into trying to figure out what the experts think about cryonics and come away without a clear answer. And part of the reason I signed up for cryonics in the first place is because it doesn't cost me much: the largest component is the life insurance for funding, only $50 / month.
So I've decided to put a bounty on being persuaded to cancel my cryonics subscription. If no one succeeds in convincing me, it costs me nothing, and if someone does succeed in convincing me the cost is less than the cost of being signed up for cryonics for a year. And yes, I'm aware that providing one-sided financial incentives like this requires me to take the fact that I've done this into account when evaluating anti-cryonics arguments, and apply extra scrutiny to them.
Note that there are several issues that ultimately go in to whether you should sign up for cryonics (the neuroscience / evaluation of current technology, estimate of the probability of a "good" future, various philosophical issues), I anticipate the greatest chance of being persuaded from scientific arguments. In particular, I find questions about personal identity and consciousness of uploads made from preserved brains confusing, but think there are very few people in the world, if any, who are likely to have much chance of getting me un-confused about those issues. The offer is blind to the exact nature of the arguments given, but I mostly foresee being persuaded by the neuroscience arguments.
And of course, I'm happy to listen to people tell me why the anti-cryonics arguments are wrong and I should stay signed up for cryonics. There's just no prize for doing so.